Microsoft has released Cumulative Updates for SQL Server 2012 Service Pack 1 and Service Pack 2. Note that RTM is no longer supported and you should be moving to the SP2 branch soon.
SQL Server 2012 Service Pack 1 Cumulative Update #13
KB #3002044
Build #11.0.3482
13 fixes (10 public)
Relevant for Service Pack 1 only ...

The SQL Server team has released SQL Server 2012 SP1 Cumulative Update #11. This cumulative update includes a fix for the online index rebuild corruption issue I discussed recently on SQLPerformance.com.
KB Article: KB #2975396
Build # is 11.0.3449
Currently there are 32 public fixes listed (32 total)
Relevant for builds ...

The SQL Server team has released SQL Server 2012 SP1 Cumulative Update #10.
KB Article: KB #2954099
Build # is 11.0.3431
Currently there are 36 public fixes listed (38 total)
Relevant for builds 11.0.3000 -> 11.0.3430. Do not attempt to install on SQL Server 2012 RTM (any build < 11.0.3000) or any other major version.

The SQL Server team has released SQL Server 2012 SP1 Cumulative Update #9.
KB Article: KB #2931078
Build # is 11.0.3412
Currently there are 29 public fixes listed (33 total)
Relevant for builds 11.0.3000 -> 11.0.3411. Do not attempt to install on SQL Server 2012 RTM (any build < 11.0.3000) or any other major version.

UPDATE 2013-08-23: 2008 R2 SP2 CU #8 is now available; details below.
UPDATE 2013-08-14: I had originally posted about SP1 CU #14, and was sure SP2 CU #8 was coming in shortly behind it, but it turns out that CU #14 has been pulled from general availability and has been converted to an on-demand hotfix update. Some people suggested this indicates ...

The SQL Server team has released CU #5 for Service Pack 1.
KB article: KB #2861107
Build # is 11.0.3373
This build has 30 fixes by my count.
Relevant for builds 11.0.3000 -> 11.0.3372. Do not attempt to install on SQL Server 2012 RTM (any build < 11.0.3000) or any previous version.